Updated doclet version

Author: Brord van Wierst

pom.xml

@@ -79,7 +79,7 @@
         if the test runs on Jitpack these values will be adjusted -->
         <md-doclet-group>com.github.iotaledger</md-doclet-group>
         <md-doclet-artifactId>java-md-doclet</md-doclet-artifactId>
-        <md-doclet-version>2.1.3</md-doclet-version>
+        <md-doclet-version>2.2</md-doclet-version>
 
         <checkstyle.config.location>checkstyle.xml</checkstyle.config.location>